com.google.web.bindery.requestfactory.shared.impl.BaseProxyCategory Maven / Gradle / Ivy
/*
* Copyright 2010 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.web.bindery.requestfactory.shared.impl;
import static com.google.web.bindery.requestfactory.shared.impl.Constants.REQUEST_CONTEXT_STATE;
import static com.google.web.bindery.requestfactory.shared.impl.Constants.STABLE_ID;
import com.google.web.bindery.autobean.shared.AutoBean;
import com.google.web.bindery.autobean.shared.AutoBeanUtils;
import com.google.web.bindery.requestfactory.shared.BaseProxy;
import com.google.web.bindery.requestfactory.shared.impl.AbstractRequestContext.State;
/**
* Contains behaviors common to all proxy instances.
*/
public class BaseProxyCategory {
/**
* Sniff all return values and ensure that if the current bean is a mutable
* EntityProxy, that its return values are mutable.
*/
// CHECKSTYLE_OFF
public static T __intercept(AutoBean bean, T returnValue) {
// CHECKSTYLE_ON
AbstractRequestContext context = requestContext(bean);
/*
* The context will be null if the bean is immutable. If the context is
* locked, don't try to edit.
*/
if (context == null || context.isLocked()) {
return returnValue;
}
/*
* EntityProxies need to be recorded specially by the RequestContext, so
* delegate to the edit() method for wiring up the context.
*/
if (returnValue instanceof BaseProxy) {
@SuppressWarnings("unchecked")
T toReturn = (T) context.editProxy((BaseProxy) returnValue);
return toReturn;
}
if (returnValue instanceof Poser) {
((Poser) returnValue).setFrozen(false);
}
/*
* We're returning some object that's not an EntityProxy, most likely a
* Collection type. At the very least, propagate the current RequestContext
* so that editable chains can be constructed.
*/
AutoBean otherBean = AutoBeanUtils.getAutoBean(returnValue);
if (otherBean != null) {
otherBean.setTag(REQUEST_CONTEXT_STATE, bean.getTag(REQUEST_CONTEXT_STATE));
}
return returnValue;
}
public static AbstractRequestContext requestContext(AutoBean bean) {
State state = bean. getTag(REQUEST_CONTEXT_STATE);
return state == null ? null : state.getCanonicalContext();
}
public static SimpleProxyId stableId(AutoBean bean) {
return bean.getTag(STABLE_ID);
}
}